Seasonal changes in 17-?? estradiol of the Rio Grande Chub (Gila pandora) in south-central New Mexico

Caldwell, C. A.; Fuller, S. A.; Gould, W. R.; Turner, P. R.; Hallford, D. M.

Abstract:

Timing of gametogensis and thus spawning can be inferred through changes in plasma concentrations of gonadal hormones. In preparation for ovulation and spawning, mean concentrations of 17??-estradiol in a population of Rio Grande chub (Gila pandora) occupying the Rio Bonito, New Mexico, peaked at 37.6 ng/mL on 16 June and declined to 1.50 ng/mL by 11 August. Similarly, the gonadal somatic index (GSI) increased from 9.02 on 21 May (n = 9) to 11.85 on 16 June (n = 2) and declined to 6.10 on 11 August (n = 2). Peak concentrations of 17??-estradiol and elevated GSI in June coincided with peak daylength for the year (14 h and 12 min) and average water temperature of 15.1??C. Concentrations of 17??-estradiol remained low through 3 October indicating no additional spawning events in the Rio Grande chub population. We demonstrated 17??-estradiol is a nondestructive and thus useful tool in estimating timing of spawning in a wild fish population.

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Article

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70026771

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Caldwell, C. A.; Fuller, S. A.; Gould, W. R.; Turner, P. R.; Hallford, D. M.

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315

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English

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Southwestern Naturalist

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Seasonal changes in 17-?? estradiol of the Rio Grande Chub (Gila pandora) in south-central New Mexico; 2004; Article; Journal; Southwestern Naturalist; Caldwell, C. A.; Fuller, S. A.; Gould, W. R.; Turner, P. R.; Hallford, D. M.